Trip arm for stop motions



Jan. 31; 1928.

1,657,958 F'. CRAWFORD, SR

TRIP ARM. FOR S'IOP MOTIONS Filed Feb. 15, 1925 vii) FRANK CRA'W 61? 1\ JV ERUHSTVTCK, NEW J32 t ATET FFlCtil.

FEET, AEESIGNQR TO CRAVTFORD MANUFACTURING COMPANY, OF NEW BRUNitWICK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Application filed February The object 01 this invention is to provide means for counterbalancing the trip arm, or drop wire, of a stop motion oi a knitting machine, or to increase or diminish the etlective weight of the trip arm, as desired,

In the accompanying drawings:

1 is a perspective view of my improved trip arm T01 stop motions;

Fig. 2 is a side view, showing the trip arm in connection with thread. guides for step motions;

Fig.3 is an end view;

Fig. l is an enlarged sectional view on the line lfl, Fig. 2;

Fig. 5 is aperspective view illustrating a modification;

Fig. 6 is a transverse sectional view on the line 66, Fi 7 Fig. 7 is a longitudinal sectional view of the modification shown in Fig. 5;

Fig. 8 is a side view out another modification; and

Fig. 9 is an end view of the modification shown in Fig. 8.

Referring to the drawings, an arm 1 projects tromthe main portion of a stop metion'ot a knitting machine. In a casing 2 of this arm is a spindle 3, which has a bent end l that is arranged to engage trip mechanism (not shown) when a thread breaks. 'Mounted on this spindle is an arm 5, which is formed by twisting the end of the arm and securing it on the spindle, as shown in Fig. 4. The arm 5 is bent, as shown in Fig. 2. Secured to the arm is a plate 6 that has an open center 7, which forms a ring. Thread guides 8 are so located in respect to i this ring that the thread as passes in front of the ring, as shown in lllig. 8, and holds the arm in position so it will not trip the stop motion.

triecured to the spindle E) is a head $3, which is formed with an opening 10 for a weight 11. This weight has a screw 12 that projects therefrom, and which extends through a slot 13 in the head. 9. On this screw is a knurled nut 141-. On turning the nut, the weight can be clamped to the head in any position desired relative to the centre of rotation of the spindle 3 to increase the effective weight of the arm or to decrease the weight, as desired, consequently increasing or decreasing respectively the pressure of the ring 6 against the thread 02.

Tn the present instance, the head. 9 is made 'rnrr Ania non snore Moments.

13, 1925. Serial No. 8,9?1.

in two parts and the base portion 15 is notched at each side to reeeive'the tongue 16 of a Uwhaped portion 17, in which the slot 13 formed; The parts are secured together by solder, or other suitable means. Other means oi forming the head may be employed withoutdeparting from the essen tial features of the invention.

In 5, 6 and 7, a modification is illustrated, in which a weight 11 is adapted to guides in a head 9 A. light spring 18 is attached to one end of the weight and is coiled around a disk 19 to which it is attached at 20. The disk 19 has a stem 12" on which is a squared port-ion to receive an adjusting disk 28. This disk is preferably graduated, as shown. On turning the disk 23, the spring is coiled or uncoiled to adjust the position of the weight 11. A. knurled nut lt is mounted on the threaded portion of the stem to secure the disk 23 in the position in which itis adjusted. The upper end of the weight has a fork 21, which engages the arm 5 to which the plate 6 issecured. The head 9 is mounted on a spindle 3 of the type illustrated in Fig. 1.

In Figs. 8 and 9 is shown a modification, in which a head 9 is in the form of a disk, which is mounted on a spindle 3 The arm 5 is secured to the head and to the spindle and carries the plate 6*.

On a screw stem 22, projecting from the head 9", are two weights 11 and 11, which can be adjusted on the stem to any position desired, and held by turning the screw stem, which looks them rigidly to the head 9*.

By the arrangement hereinbetore 'described, it will be seen that by providing a counterbalance for the trip arm, it can be madeof comparatively heavy and substantial material, and the counterbalance weights can be adjusted to accommodate threads of different weights.

T claim:

1. The combination in a stop motion, ot a supporting arm; a spindle rotatably mounted on said arm; a trip arm secured to the spindle, and having an ei'ilarged opening adjacent its outer end; thread guides co-operative with said enlarged opening for receiving a thread adapted to hold the trip arm in a raised position; a head on the spindle having an opening extending transversely across the axis of said spindle; a sliding weight mounted in the said transversely extending opening; in said head and adapted to be tittJllStGtl to any one of an intinite nuniher of positions wherein the center of gravity of said Weight is either coincident with or adjacent I either side of the centre of retation of said spindle tel-increasing or decreasing the e't'l'ective Weight of the arm; and means for securing the Weight in the posiion to Which it is adjusted.

.2. The combination in stop motion of a pivotedtrip arm; a Weight mounted for movement in a plane extending transversely oi the pivotal center of said trip arm, to a position wherein the center of gravity of said Weight is coincident with the said pivotal center of said trip arnn or to a posi tion at either side of said pivotal center in said transversely extending plane.

:3. The con'ihination in a stop motion of a rotatable spindle; a trip arni secured to said spindle; a Weightadjustahly mounted on said spindle and adapted to be moved in a plane extending transversely of the center of rotation or said spindle to a position wherein the center of gravity of said Weight coincidci'it With the aaid renter t' rotation oi said spindle or to a position at either side thereot in said transversely extending;-

plane.

l. The cenibii'iation in a stop motion of a spindle; a trip arm secured to said spindle and engaging a thread; a head on said spindle having an 01 ening extending trans vereel across the axis of said spindle; a weight slidahly mounted for l()iilitilt(lil1ilt n'ioveinent in said opening and adapted to he nioved'to any one o t a nlunher ol' diti'eaent. positions \iithin said opening \rhcrcin the center of gravity of said weight is coincident with the center ot rotation oi' said spindle or located at either side thereot: and means for securing the weight in the position to which it has hccn adjusted in! increasing or diminishing the pressure exerted by the trip arm on the thread or the Weight of said trip arni may he counterbalanced or overhalanced around the said axis of said spindle.

FRANK CRAWFORD, 81:. 

